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Diagnostic load testing of bridges - case studies

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Presentation from IALCCE 2018 on behalf of ADSTREN Cia Ltda

Published in: Design
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Diagnostic load testing of bridges - case studies

  1. 1. Diagnostic Load Testing of New Bridges Santiago Zaruma, M.Sc. Structural Engineer ADSTREN Cía. Ltda.
  2. 2. Overview - Introduction - Load Testing of Los Pajaros Bridge - Load Testing of La Armenia Interchange - Conclusions
  3. 3. - Diagnostic testing: verification of design - Deflections - Load levels  around 60% of design vehicular live load (AASHTO HL-93) Introduction - Load  measurable responses + 9.36kN/m per lane
  4. 4. Los Pajaros Bridge Load Testing
  5. 5. Los Pajaros Bridge Simón Bolívar Ave., Quito, Ecuador Los Pájaros Bridge Carapungo Interchange
  6. 6. Project description: 3 spans @ 65m = 195m Los Pajaros Bridge Construction38m
  7. 7. Project description: Los Pajaros Bridge Construction 23.6 m 3 @ 2.8m 4 @ 2.8m 2.8m web
  8. 8. Other benefits of launching: • Safer • Faster • Cheaper • Easier to inspect Other bridge components can be constructed at the same time Incremental Launching Method Los Pajaros Bridge Construction
  9. 9. Los Pajaros Bridge – Diagnostic Load Testing Does this represent this?
  10. 10. Dump truck positions 300kN each Computational Model Los Pajaros Bridge – Diagnostic Load Testing
  11. 11. Computational Model Los Pajaros Bridge – Diagnostic Load Testing
  12. 12. Field Tests Los Pajaros Bridge – Diagnostic Load Testing Load Case 3 Load Case 4 - Eight trucks  2400kN (60% design load) - Seven positions (load cases)
  13. 13. Field Tests Los Pajaros Bridge – Diagnostic Load Testing
  14. 14. Field Tests Los Pajaros Bridge – Diagnostic Load Testing
  15. 15. Field Tests Los Pajaros Bridge – Diagnostic Load Testing
  16. 16. Field Test vs. Computer Model Predictions Los Pajaros Bridge – Diagnostic Load Testing Load Case 3 Load Case 4 - Analytical predictions ~ measured responses - Bridge behaves as designed - Ready for opening to traffic
  17. 17. La Armenia Interchange Load Testing
  18. 18. La Armenia Interchange – Valle de los Chillos La Armenia Interchange – Diagnostic Load Testing - Five ramps  Steel tub-girder bridges
  19. 19. La Armenia Interchange – Valle de los Chillos La Armenia Interchange – Diagnostic Load Testing
  20. 20. Diagnostic Load Testing of Ramp 15 La Armenia Interchange – Diagnostic Load Testing
  21. 21. Diagnostic Load Testing of Ramp 11 La Armenia Interchange – Diagnostic Load Testing
  22. 22. Diagnostic Load Testing of Ramp 11 La Armenia Interchange – Diagnostic Load Testing
  23. 23. La Armenia Interchange – Ramp 11, Load Case 7 La Armenia Interchange – Diagnostic Load Testing
  24. 24. Conclusions
  25. 25. - Diagnostic load testing: new bridges = design verification - Deflections - Different load cases - Test load ~ 60% the design vehicular load - Disagreement between field and model => further studies - Presented cases: close correspondence Conclusions
  26. 26. Questions? www.adstren.com

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